Inclosed fuse.



w. J. BRUIT., Je. INGLOSBD FUSE.

APPLIGATION FILED. JUNE ll 1914l Petented Feb. 23, 1915.

e l Z5/00622? n Way/awa C'Z Jij UNITE STATES PATEN "i" `@idlgttiitltll..

WILLIAM'. J. BRITT, JR., OF ST. LOUIS, MISSOURI, ASSIGNOR TO KILLARK ELECTRIC MANUFACTURING COMPANY,`OF ST. LOUIS, MISSOURI, A CORPORATION OF MIS- SOURL INCLOSED FUSE.

Specification of Letters Tatent.

rateatea ret. es, isis.

Original application fded December 15, 1913, Serial No. 806,820. Divided and this application iiled .Tune 1,

v l 1914. Sea11ro.842,137.

To all 'whom it may concern Be it known that I, wWILLIAM J. Barra?, J r., a citizen of the United States, residing at the ,city of St. Louis, State of Missouri, have invented a certain new and useful improvement in lnclosed Fuses, (being a division of my application for Letters Patent for fuses on which issued to me September 15, 1914, Patent No. 1,110,478 of which the following is a specification, reference being had to the accompanying drawing, forming a part thereof, in which- Figure 1 is an elevational view, partly in longitudinal section, of an inclosed fuse embodyi'figj my present invention; Fig. 2 is a sil .lar view thereof taken approximately at right angles to the view shown in Fig. 1; Fig. 3 is a transverse sectional view on the lines 3 8, Figs. 1 and 2; and Fig. -l is a perspective view of a member of the terminal or contact-blade and fusible link securing-means.

This invention relates generally to electric safety fuses: and, more particularly, to a certain new and useful improvement in that classv of electric safety fuses commonly known as inclosed or cartridge fuses. Fuses rof thisclass usually comprise a hollow shell or casing of fibrous or other analogous insulation material, end-caps or closures, terminal members or contact-blades extending longitudinally of the casing and projecting therefrom at its ends through the end-caps, a suitable fusible element or link suitably electrically connected to the contact-blades and bridging the space therebetween within the casing, the fusible element or link having 'a current carrying-capacity less than. the current carrying-capacity of the contactblades and being adapted to ca-rry'the current up to a certain rated amperage and to blow or fuse on an overload or increase of current, thereby protecting the electric circuit in which the fuse may be arranged or inserted, as will be well understood, and a filling of suitable non-conducting material, preferably in a pulverulentv or finely divided state, the function of which is tol dissipate the heat and provide minute paths or interstices for the escape of the vapor or gases evolved upon the fusing orblowing of the fusiblel element. Heretofore. not

only have the blade-terminals and end-caps or closures of the casing been secured within and upon the casing in various ways and by various means, but also the fusible element or link has been usually soldered, riveted, or bolted directly to, and thereby fixed or held in electrical connection with, the terminal or contact-blades. The members or parts of fuses so constructed are, so far as I am aware, however, more or less dithcult of assemblage and more or less er.- pensiv`e to manufacture.

The principal objects of my present invention are to provide an efficient fuse of the class stated of simple, economical, and inexpensive construction, of few readily assembled and renewable parts or members, and in which the terminal orcontact-blades and fusible-element are conveniently secured not only renewably together in velectrical contact, but also operatively to, and properly centered longitudinally within, the casing.

lVith the above and other objects in View,

-my present invention resides in the provision in a fuse of the kind stated of means adapted not only-to renewably secure the blade-terminals and fusible-element together in electrical-contact' or connection, but also to operatively and removably secure the blade-terminals with their so connected fusible element to, and at the same time properly center the same longitudinally within, the casing, and in certain novel features of form, construction, arrangement, and combination of parts, all as will hereinafter be described and afterward pointed out in the claims.

Referring to the accompanying drawings, in whichlike reference characters refer to like parts throughout the several views, 1

indicates the fuse casing, which is prefer' ably an open-ended tubular shell of fibrous Aor other analogous insulation material and which may be of any suitable length and diameter as required according to the desired size or current-carrying capacity of the fuse.

9;-2 indicate suitable hanged or cupshaped preferably metallic caps which are adapted, in the finished fuse, to t on casing l at its omeosite ends and provide einsame therefor, caps 2 2 being removably secured on casing 1 by means of small screws or other like fastening means 3.

The fusible element or link of the fi'ise, which extends lengthwise of, and within casing 1, preferably comprises a plurality of members 4 4 .in the form of relatively broad fiat strips of Zine or other suitable readily fusible metal electrically connected and fastened together at their opposite inner ends by a plurality of separated wires 5 also of zinc or other suitable readily fusible metal, fusible or link-members 4 4 being adapted, as shown, to fit flatwise upon the inner ends of oppositely-disposed` relatively thick, heavy, preferably fiat fuse terminal-members or contact-blades 6 6 of copper or other suitable conducting material, which also extend lengthwise of casing l and at their' outer ends project outwardly in the finished fuse through suitable elongated or rectangular slots in the face of end caps 2 2 and thereby form or provide contact-terminals for the-fuse, each of the link members 4 4 being provided with a transverse perforation, as at 7, adapted, for purposes hereinafter appearing, to register with a corresponding transverse perforation, as at 8, in the respective blades 6. y

Adjacent each of its ends, casing 1 is provided with a pair of diametrically opposite or alining openings or perforations, as at 1a, preferably at right anglesto the openings provided for cap-securing screws 3; and since the means for renewably securing the respective blades 6 6 and link-members 4 4 not only electrically together, but also in proper operativev removable position to, and longitudinally centered within, cas! ing 1, are duplicated at the opposite ends of the casing, merely one of said means will be now here described.

Extending transversely of casing 1 and loosely, that is to say, removably, through said registering perforations 8 and 7, and thereby engaging with blade 6 and linkmember 4, is a pin 9 provided preferably integrally with an enlarged preferablyrylindrical head 10 adapted at one end to tightly, but removably, fit in one of said alining openings 1., and thereby engage with casing 1, and at its other end to impingingly bear upon or engage with one of the broad fiat faces of blade G, as clearly seen in Figs. 1 and 3. At its other or reduced end, pin 9 is threaded, as at 11, to receive an internally threaded tubular ineinber or nut 12 having a length approximately equal to the length of head 10 and being similarly adapted atene end tov tightly, but removably, fit in opposite opening l, and thereby engage with casing 1, and at its other or inner end to iinpingingly bear upon or engage with the upper casing 1. Head 10 and nut or tubular member 11 being approximately fiush at their outer or slotted faces with the periphery of casing 1, and the flanges of caps 2 2 being of sufficient length to extend inwardly be' yond said openings 1a, as seen clearly in Fig. 1, it will be evident not only that said openings 1a will be completely covered, but

also that said pinl 9 with its head 10 and nut 12. will be firmly and positively held against removal in their described blade and link-securing position.

Surrounding the. fusible element or link formed preferably, as stated, of said. fiat members 4 and wires 5 and filling the interior of casing 1, is a filling 13 of any suitable non-conducting material preferably in a pulverulent or finely divided state, vsuch as pulverized plaster of Paris, marble, or slaked lime, adapted to dissipate`the heat and provide minute paths or interstices for the escape of the vapor or gases arising or evolved upon the fusing 'or blowing of the fusible element or link, caps 2 2, which are, as is usual, preferably provided with suitable vent perforations or openings lei- 14, being firmly held by screws 3 upon ea'sing 1 and prevented vthereby, from being blown off casing 1 by the expansion of the gases generated on the fusingof said link. I ln assembling the parts or members of my new fuse` blades 6 6 and fusible-ineinbers 4 4 with-.wires 5 electrically connected or fixed thereto are lengthwise slidably inserted into casing 1. Blades 6 6 and linkinembers 4 4 being now preferably held by means of the fingers or other suitable temporary means in fiatwise engagement with their respective perforations S and 'i' in registration. pins 9 are fitted from one side transversely of casing 1 through said registering perfor-ations until their heads 10 engage at ktheir inner ends or faces with blades 6 6, the outer ends or slotted faces of heads 10 being approximately flush with the periphery of casing 1. @entering meinheis or nuts 12 are now threaded upon pins Q'to impingingly secure fusible-members l and blades G (l together in renewable surlface contact and to also firmly secure blades fi--G and the fusible link in operative longitudinally centered position within the casing 1, the outer ends or slotted faces of members oi' nuts 12 being also approximately flush with the periphery of casing l. Filling 9 and end caps 2 2 are now, as de- -or outer fiat faceof link-member 4, as also iio ` for marketing.

scribed, operatively placed Within and secured upon casing l, when the fuse is ready It will be observed that caps 2 2, in addition to holding the blade securing means in relatively fixed position, also prevent any pivotal or sidevvise movement of blades 6 6 relatively to easing l. To renevv or replace any part or member of the fuse, it is merely necessary to remove end caps 2 9, When the remaining members of the fuse may be readily taken from casing l, as will be obvious. j

My nevv fuse may be economically manufactured, and it will be observed that the several parts thereof may be readily assembled and may also be easily and conveniently renewed or replaced. l It is to be understoodtlit the fusible elementmight, if desired, be duplicated, and at the same time electrically connected to blades 6 6, on the opposite fiat faces of lblades 6 6 and that changes vin the form, construction, arrangement, and combination of the several parts of the fuse may, Within the scope of the ap,- pended claims, be made and substituted for those herein shovvn and described Without departing from the nature and principle of my invention.

Having thus'described my invention, what I claim and desire to secure by Letters Pat cnt is:

l: In a fuse of the class described, a tubular casing provided adjacent its end With a pair of diametrically opposite openings, a terminal-blade having relatively broad flat opposite faces, said blade being transversely provided with a perforation at right angles to the said faces thereof, a flat fusible mem` ber adapted to fit flatvvise upon said terminal-blade, said fusiblepmember being also transversely provided with a perforation adapted to register with said blade-perforation, and means adapted to secure said blade and fusible-member electrically together and operatively to and Within said casing, said means including a pin extending transversely of the casing through said'regisjter'- ing perfor-ations and projecting into said openings, and members on said pin impingingly engaging with said blade and fusiblemember; substantially as described.

2. ln a fuse of the class described, a tubular casing provided adjacent its end with a pair of diametrically opposite openings. a terminal-blade having relatively broad fiat opposite faces, said blade being transversely provided With a perforation at right angles to the said faces thereof, a flat fusible member adapted to fit flatwise upon said termi? nal-blade, said fusible member being also transversely provided With a perforation adapted to register ivith said blade-perfora! tion, and means adapted to secure said blade and fusible-member electrically7 together and operatively to and Within said casing, said means including a pin extending transversely of the casing through said registering perforations, and members on said pin impingingly engaging with said blade and fusible-member and projecting into said open-- ings; substantially as described.

3. rn a fuse of the class described, a tubular casing provided adjacent its end vvith a pair of diametrically opposite openings, a terminal-blade having relatively broad flat opposite faces, said blade being transversely provided vvith a perforation at right angles to the said faces thereof, a flat fusible member adapted to fit flatvvise upon said terminal-blade, said fusible-member being also transversely provided with a perforation adapted to register with said blade-perforation, and means adapted to secure said blade and fusible-member electrically together and operatively to and Within said casing, said means including a pin extending transversely of the casing through said registering perfo-4 rations, a head integral With said pin, and a nut having threaded engagement with said pin, said head and nut impingingly engaging with said blade and fusible-member and projecting into said openings; substantially as described.

el. In a fuse of the class described, a tubular casing provided adjacent its end with a pair of diametrically opposite openings, a terminal-blade ha'ving relatively broad fiat opposite faces, said blade being transversely provided With a perforation at right angles to the said faces thereof, a flat fusible-member adapted to fit flatvvise upon said terminal-blade, said fusible-member being also transversely provided With a perforation adapted 'to register with said blade-perforation, means adapted to removably secure said blade and fusible member electrically together and operatively 'to and Within said casing, said means including a pin extending transversely of the casing and loosely through said registering perforations, a head integral with said pin, and a nut having threaded Ienga-gement with said pin, said head and nut impingingly engaging with said blade and fusible-member and projecting removably into said openings, and means on the casing for removably holding said securing-means in operative position; substantially as described.

5. In a fuse of the class described, a tubular casing provided -adjacent its end with a pair of diametricallyropposite openings, a terminal-blade having relatively broad flat opposite faces, said blade being transversely provided With a perforation at right angles to the said faces thereof, a flat fusible mem ber adapted to fit llatvvise upon said terminal-blade, said fusible-member being also transversely provided with a perforation adapted to register with said blade-perforation, means adapted to removably secure said blade and fusible-member electrically flanged end-cap on said easing for removtogether and operatively to and Within saidablylholding said securing-means in operacasing, said means includirg a pin extending tive position; substantially as described.

transversely of the easing and loosely In testimony Whereof,.I have signed my 5 through said registering perforations, a name to this specieation,in the presence of l5 head integral Withsaid pin, and a nut havtwo subscribing Witnesses.

ing threaded engagement with said pin, said NVILLIAM J. BRITT,` Jn. head and nut impingingly engaging with Witnesses: said blade and fusible-member and project- RUTH PETERSON,

10 ing removablyA into said openings,` anda JOSEPH DESLOGE.

Copies of this patent may be obtained for ve centsieach, by addressing the "Commissioner of Yatents,

` Washington, D. C. 

